Restructuring - Additional Information (Details) $ in Thousands	3 Months Ended		9 Months Ended		14 Months Ended
	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) employee	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($)
Restructuring Cost and Reserve [Line Items]
Goodwill and long-lived asset impairment	$ 870	$ 41,032	$ 870	$ 41,032
Expected restructuring cash charges	130,000		130,000		$ 130,000
Restructuring and related charges	1,219	5,439	4,548	5,439
Restructuring 2017
Restructuring Cost and Reserve [Line Items]
Restructuring charges, pre tax			15,600		125,700
Restructuring charges, net of tax			14,000		115,600
Payments for restructuring			9,424	2,453	21,100
Restructuring reserve, settled without cash			$ 8,150	77	104,600
Goodwill and long-lived asset impairment					$ 86,400
Headcount reduction | employee			320
Restructuring and related charges	$ 7,423	$ 6,737	$ 15,580	$ 6,737